I purchased an RNS-E and also a wiring harness that should be plug and play. My old radio is a Bose Symphony II. Oddly, I can see the radio code faintly and then it fades away. The wiring is about as simple as it gets. Do you think the RNS-E is damaged? Bad wiring harness? Can the radio be tested somewhere to help determine what is the problem? Thanks for any help. This is my first post here and if it is in the wrong place, please direct me to a better location. Thanks again.